Fantasy, to attempt to nail it down to a simple defintion would be selling it very short. Even a rather complex one would be nesecity be incomplete.
How do you reflect the broad scope of fantasy, even as a pure genre, which it often is not. MAny interesting sttings have been formed by throwing fantasy elements into another setting, especialy ones where you may think it would not belong.
Such hybrids have lead to GURPS Technomancer, FASA's Shadow Run, much of the White Wolf game line, and a good many more.


Platoe - A setting my roomate devised sucessfully creating a world that logicly does have a flat earth as an artifical planet, and the mysteries that float around this world are many and varied.


Techno Mancer - A setting provided by Steve Jackson Games, it deals with one possible blend of magic into other settings. In this case modern day earth. In Technomancer the trinity bomb set of a storm that fed magic back into the world. And tries to deal with the ramafications of this event.